These snapshots and their corresponding diffs are automatically generated on a daily basis. They get stored here only if something has changed from the previous snapshot. The snapshots are named: am-utils--YYYYMMDD-HHMM.tar.gz where is the version of the release and includes not just the version number, but also postfixes like "-pre" or "rc1". YYYYMMDD-HHMM is a timestamp to distinguish the dates/times when these snapshots were captured. Then we have diff(1) files between every two consecutive snapshots of the same branch. The diff file names are long and look like -.diff.gz, where both and are like the tarball name, minus the tar.gz part.